Directions1. Generously season the pork tenderloin with salt and pepper.
Heat a splash of olive oil in a large pan over high heat and sear the pork on all sides until golden brown. Lightly oil the bottom of a 6-quart slow cooker, transfer the seared pork to it, and pour in the stock and sprinkle with sage.
Cover and cook on low for 8-9 hours. The pork should be incredibly tender and falling apart. Carefully remove the pork from the slow cooker and shred it using two forks.
While the pork is cooking, prepare the sauce.
Add the fresh blackberries to a blender and pulse until smooth.
Pour the mixture through a fine-mesh strainer into a bowl, pressing on the solids to extract all the pulp.
Discard the seeds left in the strainer.
In a 3. 5-quart saucepan, combine the strained blackberry pulp, balsamic vinegar, olive oil, and a pinch of salt.
Bring the mixture to a boil over medium-high heat.
Reduce the heat to low and let it simmer for 15-20 minutes, whisking occasionally to prevent sticking. For the final 2-3 minutes, whisk vigorously to help it emulsify and thicken.
Once the sauce has reached a syrupy consistency, remove it from the heat.
Let it cool and thicken for about 10 minutes before drizzling over the shredded pork to serve.
Don't skip the searing step! It creates a deep, caramelized flavor base that you won't get from just slow cooking.